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The medium-access control (MAC) protocol is one of the key components in wireless local area networks (WLANs). The main features of a MAC protocol are high throughput, good fairness, energy efficiency, and support priority guarantees, especially under distributed contention-based environment. Based on the current standardized IEEE 802.11 distributed(More)
As the need of network users for high-availability increase, how to evaluate the network availability justly becomes an on edge problem. Under the dynamic connections, a new network availability algorithm (NAA), which considers the high network performance, for WDM optical networks is proposed. It is practically to the users and operators of the network.(More)
This paper studies multihop optical networks in which nodes employ wavelength routing switches that enable the establishment of wavelength division multiplexed (WDM) channels, called lightpaths, between node pairs. In fact, most optical networks are multifiber networks. The problem of dynamical routing and assignment of wavelength (RAW) in such networks is(More)
Wavelength division multiplexing (WDM) is an important technique for next-generation networks, which offers a viable solution to fully exploit the enormous bandwidth available in fiber optics. Optical layer multicast refers to the support of point-to-multipoint connections directly at the physical layer by employing passive devices known as power splitters.(More)
Within a WDM grooming mesh network and under the constraints of the number of transceivers per node and wavelength continuity, we propose a novel dynamic grooming graph which models the number of transceivers per node in addition to the usage of wavelength and bandwidth resources. Based on the grooming graph, we first propose a dynamic traffic-grooming(More)
Network virtualization technology wherein multiple virtual infrastructures (VIs) are supported on the same underlying infrastructure is the key enabler of the cloud computing paradigm. However, due to the resource sharing, even a single server failure in the substrate will affect all the VIs mapped on to it. Thus, backup resources should be reserved(More)
In this paper, the authors focus on studying the problem of survivable routing provisioning to prevent single link failure in wavelength-division-multiplexing (WDM) mesh networks, and propose a novel protection scheme called mixed shared path protection (MSPP). With MSPP, the authors define three types of resources: 1) primary resources that can be used by(More)